Throw a more useful error when the S3 source is unable to determine bucket ownership #4021
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Description
I ran a pipeline that performed an S3 scan without an STS role ARN. Data Prepper is unable to run because it can't deduce the bucket ownership automatically. This is expected, but the failure is currently a NullPointerException which users can't benefit from.
This PR catches this case and throws a clearer exception so that users can make an actionable decision.
Issues Resolved
N/A
Check List
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